"Jessica" wrote in message <kdenag$nth$1@newscl01ah.mathworks.com>...> I have coordinates such as this:> > 384 360 60 69> > that represent the left, top, width, and height of an ellipse. How can I turn these values into a list that specifies a polygon?> > I would like to use this polygon list to find out whether particular X and Y coordinates fall inside this ellipse:> > k_inside1= inpolygon(X_Coordinate, Y_Coordinate, X_Polygon3, Y_Polygon3);> > Thanks!- - - - - - - - - It seems a shame to approximate an ellipse with a polygon to see if points lie inside it, when a direct test with the simple equation of the ellipse would accomplish the same thing with much better accuracy and simplicity.

However, here are n vertices of a polygon approximating an ellipse. Let the ellipse be defined by the equation